This room temperature-curable composition contains: (A) a prescribed polyoxyalkylene compound which has two reactive silicon groups (silyl groups having 1 hydroxy group or 1-3 organo-oxy groups) per molecule, with one reactive silicon group at each molecular chain terminal, and in which the main chain is a prescribed polyoxyalkylene-based polymer; (B) an inorganic filler; (C) a hydrolyzable (organo)silane compound and/or a partial hydrolytic condensation product thereof as a curing agent; (D) a silane coupling agent; and (E) a curing catalyst. Produced by this configuration is a cured product which exhibits excellent silicone oil resistance, excellent curing properties and good elongation and adhesive properties.

The invention relates to silane mixtures comprising a silane of the formula I
(R.sup.1).sub.y(R.sup.2).sub.3-ySi—R.sup.3—(S—R.sup.4).sub.n—S.sub.x—R.sup.5  (I)
and a silane of the formula II
(R.sup.1).sub.y(R.sup.2).sub.3-ySi—R.sup.3—S—R.sup.4—S—R.sup.3—Si(R.sup.1).sub.y(R.sup.2).sub.3-y  (II)
where the molar ratio of silane of the formula I to silane of the formula II is 15:85-90:10. The silane mixture according to the invention can be prepared by mixing the silanes of the formula I and silanes of the formula II.

The invention relates to silane mixtures comprising a silane of the formula I
(R.sup.1).sub.y(R.sup.2).sub.3-ySi—R.sup.3—(S—R.sup.4).sub.n—S.sub.x—R.sup.5  (I)
and a silane of the formula II
(R.sup.1).sub.y(R.sup.2).sub.3-ySi—R.sup.3—S—R.sup.4—S—R.sup.3—Si(R.sup.1).sub.y(R.sup.2).sub.3-y  (II)
where the molar ratio of silane of the formula I to silane of the formula II is 15:85-90:10. The silane mixture according to the invention can be prepared by mixing the silanes of the formula I and silanes of the formula II.

Disclosed is a reactive hot-melt adhesive composition, containing: a urethane prepolymer having a polymer chain including a structural unit derived from polyol and a structural unit derived from polyisocyanate, and an isocyanate group as a terminal group of the polymer chain; and a functional group protection type silane coupling agent.

Disclosed is a reactive hot-melt adhesive composition, containing: a urethane prepolymer having a polymer chain including a structural unit derived from polyol and a structural unit derived from polyisocyanate, and an isocyanate group as a terminal group of the polymer chain; and a functional group protection type silane coupling agent.

An organopolysiloxane modified with a lactate silyl at both ends according to the present invention, which is represented by general formula (1)

##STR00001##

(wherein each of R.sup.1, R.sup.2 and R.sup.3 independently represents an unsubstituted or substituted monovalent hydrocarbon group having 1-10 carbon atoms; m represents an integer of 10 or more; each a independently represents 2 or 3; and X represents an alkylene group having 2-4 carbon atoms or an oxygen atom), is useful as a starting material siloxane for a surface treatment agent for inorganic materials, a coating agent for water repellent treatments, and especially for a room-temperature curable (RTV) silicone rubber composition.

An organopolysiloxane modified with a lactate silyl at both ends according to the present invention, which is represented by general formula (1)

##STR00001##

(wherein each of R.sup.1, R.sup.2 and R.sup.3 independently represents an unsubstituted or substituted monovalent hydrocarbon group having 1-10 carbon atoms; m represents an integer of 10 or more; each a independently represents 2 or 3; and X represents an alkylene group having 2-4 carbon atoms or an oxygen atom), is useful as a starting material siloxane for a surface treatment agent for inorganic materials, a coating agent for water repellent treatments, and especially for a room-temperature curable (RTV) silicone rubber composition.

The present invention relates to a novel waterproof/water-repellent composition in which the shrinkage, expansion, deterioration, aging, etc. of the conventional waterproof/water-repellent composition are alleviated and, more specifically, to a reinforced waterproof/water-repellent composition capable of preventing a crevice leakage due to the shrinkage of the conventional silicone without causing a shrinkage after construction, which thus provides a transparent aqueous acrylic silicone-based waterproof/water-repellent composition comprising: 100 parts by weight of composition A, wherein the composition A includes 1 to 3 wt % of a silyl compound of formula (1) below, 1 to 3 wt % of organosilane of formula (2) below, 1 to 2 wt % of aminosiloxane of formula (3) below, 4 to 12 wt % of one or two or more aqueous acrylic resins selected from butylacrylate, ethylacrylate, methylacrylate, 2-ethylhexyl acrylate, methacrylates, 2-chloroethyl vinyl ether (2-chloroethyl vinyl ether), hydroxyethyl methacrylate, butyl methacrylate, and trimethylolpropane triacrylate (TMPTA), 0.03 to 0.05 wt % of a pH stabilizer, 0.003 to 0.005 wt % of a chelating agent, and 80 to 92 wt % water,

##STR00001## wherein R1 is a linear or branched saturated alkyl group having 1 to 5 carbon atoms, and R2 is a linear or branched saturated alkyl group having 1 to 18 carbon atoms,

##STR00002## wherein R2 is an alkyl group having 1 to 12 carbon atoms, and R3 is an alkoxy group having 1 to 6 carbon atoms,

##STR00003## wherein R3 is a saturated alkyl group having 1 to 5 carbon atoms, R4 is an alkyl group having 1 to 18 carbon atoms containing at least one nitrogen (N), and n is 3 or more; 0.5 to 5 parts by weight of composition B including 27 to 29 parts by weight of 2-ethylhexyl acrylate, polymer with 1-methyl-4-vinylbenzene and isobutyl methacrylate, and 71 to 73 parts by weight of water; and 70 to 87 parts by weight of silica powder, in which the composition is excellent in non-shrinkability and continuous elasticity and has a remarkable anti-slippery effect, etc., due to the roughness caused by the silica sand powder on the solidified floor surface while solving the problems of the conventional waterproof/water-repellent composition.

The present invention relates to a novel waterproof/water-repellent composition in which the shrinkage, expansion, deterioration, aging, etc. of the conventional waterproof/water-repellent composition are alleviated and, more specifically, to a reinforced waterproof/water-repellent composition capable of preventing a crevice leakage due to the shrinkage of the conventional silicone without causing a shrinkage after construction, which thus provides a transparent aqueous acrylic silicone-based waterproof/water-repellent composition comprising: 100 parts by weight of composition A, wherein the composition A includes 1 to 3 wt % of a silyl compound of formula (1) below, 1 to 3 wt % of organosilane of formula (2) below, 1 to 2 wt % of aminosiloxane of formula (3) below, 4 to 12 wt % of one or two or more aqueous acrylic resins selected from butylacrylate, ethylacrylate, methylacrylate, 2-ethylhexyl acrylate, methacrylates, 2-chloroethyl vinyl ether (2-chloroethyl vinyl ether), hydroxyethyl methacrylate, butyl methacrylate, and trimethylolpropane triacrylate (TMPTA), 0.03 to 0.05 wt % of a pH stabilizer, 0.003 to 0.005 wt % of a chelating agent, and 80 to 92 wt % water,

##STR00001## wherein R1 is a linear or branched saturated alkyl group having 1 to 5 carbon atoms, and R2 is a linear or branched saturated alkyl group having 1 to 18 carbon atoms,

##STR00002## wherein R2 is an alkyl group having 1 to 12 carbon atoms, and R3 is an alkoxy group having 1 to 6 carbon atoms,

##STR00003## wherein R3 is a saturated alkyl group having 1 to 5 carbon atoms, R4 is an alkyl group having 1 to 18 carbon atoms containing at least one nitrogen (N), and n is 3 or more; 0.5 to 5 parts by weight of composition B including 27 to 29 parts by weight of 2-ethylhexyl acrylate, polymer with 1-methyl-4-vinylbenzene and isobutyl methacrylate, and 71 to 73 parts by weight of water; and 70 to 87 parts by weight of silica powder, in which the composition is excellent in non-shrinkability and continuous elasticity and has a remarkable anti-slippery effect, etc., due to the roughness caused by the silica sand powder on the solidified floor surface while solving the problems of the conventional waterproof/water-repellent composition.

A polysilazane composition comprising an organopolysilazane compound free of Si—H structure and an organoxysilane compound having at least two silicon atoms in the molecule does not release hazardous substances such as hydrogen or require reactive solvents.